Ramírez-Valiente José A, Poyatos Rafael, Blackman Chris J, Cabon Antoine, Castells Eva, Cochard Hervé, Creek Danielle, Delzon Sylvain, García-Valdés Raúl, Limousin Jean-Marc, López Rosana, Martin-StPaul Nicolas, Moreno Myriam, Rowland Lucy, Santiago Louis S, Schuldt Bernhard, Torres-Ruiz José M, Valade Aude, Martínez-Vilalta Jordi, Mencuccini Maurizio
CREAF, Cerdanyola del Vallès, Spain.
Instituto de Ciencias Forestales (ICIFOR-CN INIA), CSIC, Madrid, Spain.
Nat Ecol Evol. 2025 Aug 22. doi: 10.1038/s41559-025-02830-4.
Understanding how plants adjust their hydraulic system to the environment is essential to predict how these organisms will respond to global change. Here we compiled a dataset and performed meta-analysis on 223 studies on plastic and evolutionary adjustments of hydraulic traits to air temperature, CO concentration, irradiance, soil nutrient and water availability. On average, species plastically increased embolism resistance and sapwood area per leaf area under drier conditions, with a decrease in stem-specific hydraulic conductivity and water potential at the turgor loss point, which are consistent with adaptive responses. However, the average increased embolism resistance was not sufficient to compensate the reduction in the minimum water potential, implying a lower safety margin from lethal hydraulic failure under drought. These results point towards a general critical increase in the risk of hydraulic failure in future drier environments. Plastic responses to increased soil nutrient content and irradiance did not always align with those to drought, highlighting the potential for changes in light and nutrient conditions to modify plant hydraulic responses to climate-change-driven droughts.
了解植物如何调整其水力系统以适应环境对于预测这些生物体如何应对全球变化至关重要。在此，我们汇编了一个数据集，并对223项关于水力性状对气温、二氧化碳浓度、辐照度、土壤养分和水分有效性的可塑性和进化调整的研究进行了荟萃分析。平均而言，在更干燥的条件下，物种会可塑性地提高栓塞抗性和每叶面积的边材面积，同时茎比导率和膨压丧失点处的水势降低，这与适应性反应一致。然而，平均增加的栓塞抗性不足以补偿最低水势的降低，这意味着在干旱条件下致命水力故障的安全边际较低。这些结果表明，在未来更干燥的环境中，水力故障风险普遍会显著增加。对土壤养分含量和辐照度增加的可塑性反应并不总是与对干旱的反应一致，这凸显了光照和养分条件变化改变植物对气候变化驱动的干旱的水力反应的可能性。
